Factor of safety (coefficient of utilization)

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Appendix E

Appendix E

Factor of safety (coefficient of utilization)

E.1. Wire rope 1

E.1.1. For a wire rope used in the construction of a sling or

forming part of a derrick, derrick crane or crane on board ship, the

factor of safety should be: 2

– in the case of a wire rope forming part of a sling:

– in the case of a wire rope forming an integral part of a derrick,

etc.:

E.1.2. For a wire rope forming part of a crane other than on

board ship, the factor of safety should be:

1See Chapter 4, section 4.4.3, in particular para. 2.

2In the case of multi-legged slings, this is the safe working load of

the complete sling.

Safe working load of the sling (SWL)2Factor

Up to and including 10 tonnes 5

Over 10 tonnes up to and including

160 tonnes 10,000

(8.85 × SWL) + 1,910

Over 160 tonnes 3

Safe working load of the derrick,

derrick crane, etc. (SWL)

Factor

Up to and including 160 tonnes 10,000

(8.85 × SWL) + 1,910

Over 160 tonnes 3